Based on the ISBN numbers supplied by James Byrd, "A Tapestry of Orbits" is orderable from my local book store (via Cambridge University Press). However, the asking price is over $100 Canadian. Anyway you convert it, it's a lot of money. ...Dear...all I really want for my birthday..... :) Clear skies....Bill bkro@gwl.ca bkrosney@mbnet.mb.ca